Group platform admin tools into hub pages

- add grouped platform admin hub pages, view models, and shared card UI\n- simplify the super admin nav and dashboard quick links around the new hubs\n- fix the AiQuoteService EstimatedMinutes assignment so the infrastructure project builds cleanly

src/PowderCoating.Web/ViewModels/PlatformAdmin/PlatformAdminHubViewModel.cs

@@ -0,0 +1,11 @@
+namespace PowderCoating.Web.ViewModels.PlatformAdmin;
+
+public class PlatformAdminHubViewModel
+{
+    public string Title { get; set; } = string.Empty;
+    public string PageIcon { get; set; } = string.Empty;
+    public string Intro { get; set; } = string.Empty;
+    public string? WarningTitle { get; set; }
+    public string? WarningMessage { get; set; }
+    public IReadOnlyList<PlatformAdminLinkCardViewModel> Cards { get; set; } = Array.Empty<PlatformAdminLinkCardViewModel>();
+}

src/PowderCoating.Web/ViewModels/PlatformAdmin/PlatformAdminLinkCardViewModel.cs

@@ -0,0 +1,13 @@
+namespace PowderCoating.Web.ViewModels.PlatformAdmin;
+
+public class PlatformAdminLinkCardViewModel
+{
+    public string Title { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public string Controller { get; set; } = string.Empty;
+    public string Action { get; set; } = string.Empty;
+    public string Icon { get; set; } = string.Empty;
+    public string BadgeText { get; set; } = string.Empty;
+    public string BadgeStyle { get; set; } = string.Empty;
+    public Dictionary<string, string>? RouteValues { get; set; }
+}